Gasoline engine



Feb. 9 '1926.

w. l. TWOMBL'Y GASOLINE ENGINE Filed Jun e 6. 1922 INVENTOR. f

/ ATTORN Y.

Patenten. Fees. 1926.

UNITED STATES PATENT OFFICE.

WILLARD I. TWOMBLY, OF NEW YORK, Y., ASSIGNOR, BY MESNE ASSIGNMENTS,'.lO THE WILCOLATOR COMPANY, 0F NEWARK, NEW JERSEY, A CORPORATION OFDELAWARE.

Application mea :rune e,

To all whom t may concern:

Be it known that I, WILLARD I. TwoM- BLY, a citizen of the UnitedStates, residing in the borough of Manhattan, city, county, and State ofNew York, have invented certain new and useful Improvements in GasolineEngines, of which the following is a specification.

This invention relates to gasoline engines, and has to do moreparticularly with fidevices for controlling the explosive mixturesupplied to the cylinders of such engines.

The object of the invention is to provide a control mechanism by whichthe richness of the explosive mixture may readily be controlled, moreparticularly during the starting of the en ine. As is well-known, it isfrequently di cult to start gasoline engines, particularly in coldweather, due to the fact that the cold passages through which theexplosive mixture is introduced into the cylinders of the enginecause acondensation of the fuel, with the result that the mixture actuallyentering the cylinders become leaner than is desirable. When the enginehas been running for a short length of time, the cylinders and theintake manifold become heated so that this difficulty is obviated. Thepresent invention involves the provision of a control mechanism whichpermits the introduction of additional quantities of fuel into theintake manifold when the gases in the exhaust manifold are below theordinary running temperature. When this temperature has been reached,the mechanism operates to cut off the flow of raw fuel, and if thetemperature is exceeded the mechanism further operates to admit air intothe intake manifold so that the explosive "mixture is reduced in fuelcontent to the desired extent.

The device includes a casing which is disposed adjacent the exhaustmanifold and contains air and fuel inlets placed opposite each other andcontrolled by spring-pressed valves, the stems of which lie in opposedrelation. An outlet from the casing is connected with the intakemanifold and within the casing Vis a thermostatic element which isaffected by the temperature present in the exhaust gases. The free,movable end of the element lies between the valve stems and when thetemperature of the exhaust gases is low, the element lies in a positionwhich causes the fuel valve to be freed from its seat, thus permittingfuel to be drawn 'the engine.

GASOLINE ENGINE.

1922. Serial No. 566,423.

through this intake and delivered through the outlet opening to theintake manifold of lrVh'en the temperature of the exhaust gases\hasrisen to a certain point the element moves to a neutral position so thatthe fuel valve is closed, but when this temperature is exceeded theelement moves to a third position, in which it bears against the airinlet valve and lifts it from its seat so that air is drawn through thecasing into the intake manifold. The device is simple and compact, andsince the valves are operated directly from the thermostatic element, lapositive action is provided for.

I will describe one form of apparatus embodying my invention and willthen point out the novel features thereof in claims.

In the accompanying drawing Fig. 1 is a view showing in transversesection one form of apparatus embodying my invention.

Fig. 2 is a sectional view of the line 2-2 of Fig. 1 looking in thedirection indicated by the arrows. Fig. 3 is a sectional view on theline 3 3 of Fig. 1 looking in the direction indicated by the arrows.

Similar reference characters refer to simi- 11, which connects with apipe 12 leading to the intake manifold suction line of the engine.

Referring particularly to Fig. 1 it will he seen that the casing 10 isfurther provided with two oppositely disposed openings which arescrew-threaded to receive two valve plugs 13 and 14. Valve plug 13 opensinto a pipe 15, leading to the main gasoline line, which supplies fuelto the engine,.whereas the plug 14 contains vent holes 25 opening toatmosphere. The valve plug 13 is provided with a valve seat and with amovable valve 17, which is pressed to a closed position against thisseat by a spring 18. This'valve 17 carries a stem 19 which projectsinwardly toward the middle of the casing 10 and is rectangular in crosssection as shown in Fig. 3 to permit the flow of gasoline to theinterior of the casing when the valve is open. The valve plug 14 issimilarly provided with a valve seat with which cooperates a movablevalve 20. This valve is pressed to close against its seat by a spring21, and is provided with a stem 22 projecting inwardly toward the centreof the casing 10, and having a cross section similar to that of the stem19.

The reference character 23 designates a thermostatic member, one end ofwhich is fixed in the plug 10u by rivets 211. The opposite end of thismember is free to move and is positioned between the two valve stems 19and 22. Movement of the member 23 downwardly as found in Fig. 1 willobviously open valve 17, whereas movement of this member upwardly asviewed in the same lfigure will open valve 20.

The parts are so proportioned that when the gases in the exhaustmanifold are cold, the thermostatic member 23 occupies the position inwhich it is shown in F ig. 1, in which position it will be noted thatthe gasoline valve 17 is open so that raw gasoline is supplied directlyto the intake manifold of the engine through the pipe 12. Nhen theengine is started the temperature on the exhaust manifold rises andtheeffect of this is to cause the thermostatic member 23 to gradually moveupwardly as viewed in F ig. 1. This permits the gasoline valve 17 toclose gradually, and after this valve is fully closed the member 23engages the stem 22 to gradually open the air valve 20, in other words,as the engine warms up, the supply of raw gas is gradually discontinued,and after this supply ceases a gradually increasing volume of air issupplied to the intake manifold until the maximum temperature of theengine is attained.

It will be seen from the foregoing that by virtue of my invention I amableto automatically supply a comparatively rich mixture to theenginefto facilitate starting when the engine is cold, and acomparatively lean mixture to permit economical operation after theengine is fully heated.

Although I have herein shownV and described only one form of apparatusembodying my invention, it is understood that various changes andmodifications may be made therein within the scope of the attendingclaims, without departing from the spirit and scope of my invention.

vWhat I claim as my invention is:

1. A control device for internal combustion engines having exhaust andintake manifolds, which comprises a casing dismuseo posed adjacent theexhaust manifold and having a fuel inlet and an air inlet, a valvecontrolling each inlet, these valves having stems lying in opposedrelation, an outlet from the casing connected to the intake manifoldofthe engine, and a thermostatic element in the casing affected by thetemperature in the exhaust manifold and having a movable end lyingbetween the valves and operable to open either valve without affectingthe other.

2. A control device for internal combustion engines having exhaust andinlet manifolds, which comprises a casing having one end seated in theexhaust manifold and having an outlet connected to the intake manifold,an air inlet and a fuel inlet in the casing arranged in opposedrelation, a valve for controlling each inlet, these valves havingaligned stems entering the casing, and a therinostatic element havingone end held in that portion of the casing 'which is seated in theexhaust manifold and having its free end lying between the valve stems,this elcment being adapted to be Amoved upon changes in temperature toforce either valve from its seat without affecting the other.

3. A control device for internal combustion engines having exhaust andinlet manifolds, which comprises a casing disposed adjacent the exhaustmanifold, a fuel inlet'and an ai;` inlet in the vcasing lying in opposedrelation, a valve controlling each inlet, an outlet from the casingconnected to the intake manifold of the engine, and a thermostaticelement in the casing affected by temperature changes in the exhaustmanifold and operable to'open either valve without affecting the other.

4. A control device for internal combustion engines having exhaust andinlet manifolds, which comprises a casing disposed adjacent the exhaustmanifold, a fuel inlet and an air inlet in the casing, these inletslying in opposed relation, a valve controlling each inlet, a springholding each valve in its seat, an outlet from the casing connected tothe intake manifold of the engine, and a thermostatic element in thecasing affected by the temperature in the exhaust manifold and having amovable end lying between the valves, this element being operable uponchanges in temperature in the exhaust manifold to open either of thevalves without affecting the other.

WILLARD I. TWOMBLY.

